METHOD FOR IMPROVEMENT OF HYDRODYNAMIC COMMUNICATION OF WELL WITH PRODUCTIVE FORMATION Russian patent published in 2013 - IPC E21B43/16 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method involves sealing of the space behind the string of a production well, opening of productive formation, hydraulic fracturing of productive formation by means of installation of a packer above roof of perforated productive formation, pumping to under-packer zone of hydraulic fracturing liquid, creation in the under-packer zone of hydraulic fracturing pressure and forcing-through of hydraulic fracturing liquid to the formed crack. At waterflooding of the product of production well till maximum efficient value, interval of water influx to the productive formation is determined by means of geophysical investigations. After that, pumping of the locking composition is performed to water influx interval of the productive formation. Then, sealing of the space behind the string is performed at perforation interval of the productive formation. Then, opening of productive formation is performed except for intervals of isolated water influx with a drilling perforator with phasing angle of 60° with diameter of inlet perforation holes in the casing string of not less than 12 mm and perforation density of not less than 18 holes/running metre. At perforation intervals in downward direction there performed is interval-by-interval hydraulic fracturing of productive formation with formation of fractures and forcing-through in them of hydraulic fracturing liquid together with reinforcing agent of cracks, which includes equal portions of proppant fraction of 30/60 mesh to 10/14 mesh; after that, the production well is put into operation.

EFFECT: simpler and cheaper method, higher sealing quality of the space behind the string at perforation interval of the productive formation.

3 ex, 3 dwg